noun
Usage: often capitalized C&B
Etymology: probably from code (I) (set of procedures) + blue (II) (characteristic color of cyanosis)
: a state of medical emergency or a declaration of such a state along with a call for medical personnel and equipment to attempt to resuscitate a patient especially when in cardiac arrest or respiratory distress or failure
summoned by emergency Code Blues , doctors had brought her back to life more than once — Bill Bryan
also : the attempt to resuscitate the patient